Pontil
n. 铁棒
✅ 同义词
🗣️ 情景例句
I've never been more serious.
我从来没有比现在更认真了。
Do you understand?
你明白了吗？
This would solve the problem of ventilation, for if a train entered this tunnel, it would draw in fresh air behind it.
因为如果有列火车开进隧道，它就把新鲜空气随之抽进了隧道。